(19)
(11) EP 0 109 504 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.03.1987 Bulletin 1987/13

(43) Date of publication A2:
30.05.1984 Bulletin 1984/22

(21) Application number: 83109328

(22) Date of filing: 20.09.1983
(84) Designated Contracting States:
DE FR GB

(30) Priority: 18.11.1982 US 442820

(71) Applicant: International Business Machines Corporation
 ()

(72) Inventor:
  • Piazza, William Joseph
     ()

   


(54) Protection system for storage and input/output facilities and the like


(57) Protection system associated with a device (11), responsive to a selected status signal and to a predetermined sub-range of address signals (6) from a microprocessor (1) to supply a protection gating signal (9) when a particular sub-range of address signals (6) is supplied by the microprocessor (1) to allow access to the device (11) whose address correctly corresponds to the particular sub-range of address signals (6). This system may be applied to a variety of storage facilities such as random access memories or programmable read only memories.






Search report